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Port 99

Port
Protocol
Service Name
Description
Source
99
TCP UDP
metagram
Metagram Relay
IANA
99
TCP 
WIP Message protocol,Unofficial
wikipedia
99
TCP 
Hidden Port
emsisoft
99
TCP 
Hidden Port, NCX
anti-trojan
99
 
Hidden Port
sans.org
99
TCP 
Hidden Port
bekkoame
99
TCP 
NCX
bekkoame
99
TCP UDP
metagram
Metagram Relay
bekkoame

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);